Yes, according to the CVS web site, there are 24-hour pharmacies available. While not every pharmacy is open 24 hours a day, there are various locations that are open at all hours of the day.
In many of the 24-hour pharmacy locations, the rest of the store is open for 24 hours as well. This provides around-the-clock access to items such as diapers, baby food and over-the-counter medications. Many of the 24-hour locations also have a MinuteClinic, which are typically open during regular business hours. The MinuteClinic is a walk-in medical clinic staffed with physician assistants and nurse practitioners who are able to provide care for common illnesses and injuries.